Should states test marijuana for potency, purity and safety?

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FILE - This Jan. 4, 2013 file photo shows Genifer Murray, founder and CEO of CannLabs, in her lab in Denver. With Oregon, Washington and Colorado all making pot more widely available to the public, testing for safety, purity, potency and active ingredients is adding to the legitimacy of a drug once on the outlaw fringes of society. (AP Photo/Ed Andrieski, File)